Twenty-five random samples of n = 6 were taken in a control chart application and it was found that the grand average is = 5.240 cm and = 0.0026.
a. Set up and R control charts for this application.
b. The following measurements are taken: 5.2, 4.5, 5.5, 3.4, 5.3, and 5.5. Is the process still in control?